And still; the reaction with 2H+ +2e- --> H2 will theoretically be able to oxidize Fe to Fe3+ (from standard reduction potential).
Nope. As far as I am aware H+
(not sulfuric acid, just H+
) is capable of oxidizing solid Fe to Fe2+
but not further.
Yes, concentrated sulfuric acid is an oxidizer and in some specific cases can get reduced to SO32-
. Not in the presence of excess water though, and 3M solution is quite diluted.